User Rating: 2 / 5

Star ActiveStar ActiveStar InactiveStar InactiveStar Inactive
 

Comparison and Logical operators are used to test for true or false

 

Comparison operators are used in logical statements to determine equality or difference between variables or values.

Given that x=5, the table below explains the comparison operators:

Operators                        Description                  Comparing Returns
== equal to x==8 false
     x==5  true
  === exactly equal to x==="5" false
   (equal to value and equal type) x===5 true
 !=  not equal  x!8 true
 !== not equal (different values   x!=="5" true
   or different type)  x!==5  false
 > greater than  x>8 false 
 < less than   x<8 true
 >= greater than or equal to x>=8  false 
 <= less than or equal to   x<=8 true

 

Logical Operators are used to mark the relationship. Different variables or values

Given that x=6 and y=3, the table below explains the logical operators:

Operators         Description            Example

  &&                     and                 (x < 10 && y > 1) is true

  ||                       or                   (x==5 || y==5) is false

   !                       not                 !(x==y) is true

 

Conditional Operators

JavaScript also contains a conditional operato that assigns a value to a variable based on some condition.

Syntax

variablename=(condition)?value1:value2

Example: If the variable age is a value below 18, the value f the variable voteable will be "Too young, otherwise the value of voteable will be "Old enough": 

<html>
<body>
<p>Click the button to check the age.</p>
Age:<input id="age" value="18" />
<p>Old enough to vote?</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction()
{
var age,voteable;
age=document.getElementById("age").value;
voteable=(age<18)?"Too young":"Old enough";
document.getElementById("demo").innerHTML=voteable;
}
</script>
</body>
</html>
This is the result:

 

 

 

Next 

Chapter 12 - JavaScript Conditions

 

Recent Topics
Subject
Post Reply
Open
Recent
Does MD Watermark work under Joomla 3.9.20?
By Balazs Thu 16 Jul 2020 4:48 pm Board English Language
6
667
Thu 16 Jul 2020 10:31 pm By Balazs
The program calculates the PMT
By prmindphp Wed 20 May 2020 6:45 pm Board English Language
1
230
Thu 21 May 2020 5:57 pm By prmindphp
Helper for calculating NPER values
By prmindphp Tue 19 May 2020 6:55 pm Board English Language
1
213
Thu 21 May 2020 5:59 pm By prmindphp
Program that will be used for home loan calculations
By prmindphp Mon 18 May 2020 6:49 pm Board English Language
1
237
Thu 21 May 2020 6:02 pm By prmindphp
Tools that will help calculate car tax
By prmindphp Thu 14 May 2020 7:00 pm Board English Language
1
228
Fri 15 May 2020 12:03 am By prmindphp
Helper to create slidershow, Module Product Slide of MooZiiCart
By prmindphp Thu 30 Apr 2020 6:32 pm Board English Language
0
290
Thu 30 Apr 2020 6:32 pm By prmindphp
Helper in searching products by category and keywords with Module Ajax Search of MooZiiCart
By prmindphp Tue 28 Apr 2020 6:17 pm Board English Language
0
257
Tue 28 Apr 2020 6:17 pm By prmindphp
Helper to restore the system to clear data, Plugin System MRestore
By prmindphp Fri 24 Apr 2020 7:05 pm Board English Language
0
241
Fri 24 Apr 2020 7:05 pm By prmindphp
Creating social share buttons, share the website's content to Social Media With Plugin Content Msocial
By prmindphp Wed 22 Apr 2020 7:05 pm Board English Language
0
229
Wed 22 Apr 2020 7:05 pm By prmindphp
Create Content Marketing and Product with Content Product Match of MooZiiCart
By prmindphp Tue 21 Apr 2020 7:19 pm Board English Language
0
269
Tue 21 Apr 2020 7:19 pm By prmindphp
Filtering for find the product with Module Filter product of MooZiiCart
By prmindphp Thu 09 Apr 2020 6:51 pm Board English Language
0
269
Thu 09 Apr 2020 6:51 pm By prmindphp
Template Megadeal of MooZiiCart for creating websites to sell products online
By prmindphp Fri 03 Apr 2020 6:45 pm Board English Language
0
427
Fri 03 Apr 2020 6:45 pm By prmindphp
[MooZiiCart] [Module] Displaying products that customers are interested by Wishlist Module
By prmindphp Fri 27 Mar 2020 5:46 pm Board English Language
0
634
Fri 27 Mar 2020 5:46 pm By prmindphp
Show the Bestsellers Product by Module Bestseller
By prmindphp Wed 25 Mar 2020 6:04 pm Board English Language
0
434
Wed 25 Mar 2020 6:04 pm By prmindphp
Show Products Category by Module Category
By prmindphp Tue 24 Mar 2020 6:07 pm Board English Language
0
535
Tue 24 Mar 2020 6:07 pm By prmindphp
Plugin System MZC Auto Close to enable the open and close odering system
By prmindphp Wed 19 Feb 2020 6:38 pm Board English Language
0
3126
Wed 19 Feb 2020 6:38 pm By prmindphp
MDPartner Component for store client data in CRM system
By prmindphp Sat 25 Jan 2020 3:04 pm Board English Language
0
893
Sat 25 Jan 2020 3:04 pm By prmindphp
i am looking for help
By Anonymous Tue 14 Jan 2020 5:46 pm Board English Language
1
924
Tue 14 Jan 2020 6:03 pm By noppadonsk
Dot Net Training
By Poonaam Fri 10 Jan 2020 2:20 pm Board English Language
0
1173
Fri 10 Jan 2020 2:20 pm By Poonaam
MDRental, Area management assistant for rental business
By prmindphp Wed 08 Jan 2020 6:51 pm Board English Language
0
908
Wed 08 Jan 2020 6:51 pm By prmindphp